January 21, 2022
by Iowa State University
Addressing climate change is a massive and daunting challenge. But many economists say gradually increasing taxes on emissions would significantly reduce the amount of greenhouse gas spewed into the air at the lowest economic cost.
"The question is, will manufacturing firms respond to the tax? That's where our paper comes in, and it looks like the answer is yes," said James Brown, Kingland MBA Professor and chair of finance in Iowa State University's Ivy College of Business.
Brown emphasized that his new paper published in The Review of Financial Studies,one of the top peer-reviewed academic journals in the field of finance, does not provide a policy recommendation. Rather, he and his co-authors offer an analysis of data they collected on roughly 33,500 manufacturing firms across 18 countries to better understand what happens when countries start taxing companies for emitting greenhouse gases.
Brown and his research team found a strong, clear link between countries implementing high emissions taxes and manufacturing firms substantially increasing investments in research and development (R&D).
"Now, what exactly that means, is a much harder question to answer. That's where we try to make inferences with a lot of additional tests," said Brown.
Brown said people typically think of R&D as a path to new products. For example, if a pharmaceutical company increases its R&D spending, it's probably trying to develop a new drug that can be patented and sold on the market.
But during the researchers' deep data dive, they found companies that significantly increased their R&D following the implementation of emissions taxes did not lead to a slew of new patents. This, Brown explained, indicates that manufacturing firms were using R&D dollars to expand their capacity to adopt and implement new technologies that change the way they produce—rather than to develop new patentable products.
An efficient shift
"Firms don't always have the incentive to shift to cleaner production technologies on their own; that is where policy can potentially have an impact," said Brown.
"Command and control" regulations (e.g., requiring manufacturers to install specific types of emissions mitigation equipment) are another policy tool that can lead to less pollution, but Brown said the emissions tax approach is likely a more efficient policy lever. This is because a tax on emissions forces firms to internalize at least some of the costs of dirty production, which incentivizes them to find cleaner ways of producing in the most cost-effective way possible.
"We usually think about shifts to less polluting ways as being very costly to the economy, but if you encourage this shift through R&D and new technology adoption, you can move to a cleaner production process without necessarily slowing economic growth," said Brown.
The newly published study found the biggest jump in R&D investments in response to country-level emissions taxes occurred in sectors that are high polluters and have a lot of what Brown called 'knowledge spillovers.' Knowledge spillage refers to the ease at which information spreads between firms in the same sector.
"If you're a polluting firm in a sector where knowledge is readily spilling across firms, you have more incentive to invest in R&D and incorporate cleaner ways of manufacturing that have already been developed by another company or external experts," Brown explained.
Brown said examples of high pollution industries with high knowledge spillovers include cement, lime and mineral products. In contrast, petroleum and steel are high pollution industries with relatively low knowledge spillovers.
From macro to micro
In the researchers' data analysis, Japan accounted for the most observations, followed by the United Kingdom and Canada. Brown said the researchers did not pull data from the U.S. because it does not have a country-level emissions tax like other countries; trying to include data from the U.S. could have skewed the results because there are too many regional differences in environmental regulations.
Brown and his research team are working on a follow-up study with the goal of pinpointing what exactly the R&D dollars are flowing towards and whether emissions actually drop.
"Understanding at a micro-level what these taxes are doing specifically to dirty emissions is what we need. We can't do that on the cross-country scale we used for this study, but we could maybe do that at a country-specific scale," Brown said.
Additional research questions Brown wants to answer:
Researchers from KTH Royal Institute of Technology in Stockholm, Sweden contributed to the study published in The Review of Financial Studies.
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